What makes you love YA?

The way the YA genre has exploded in recent years has been quite the phenomenon. Luckily for me, it's what I've always written (before I knew what "YA" even was). Well, other than that one unfortunate attempt at writing an adult fiction novel. With the knowledge I have now, I know I could go back and make it a much better book. Maybe someday. But my passion is YA, and for now, I'm sticking with it.

In any genre, there will be books that don't live up to your hopes, and others that far exceed them. In my opinion, the best books are the ones that you are dying to finish so you can find out what happens, and yet simultaneously wish could go on forever because you love it so much. One of the most interesting (and sometimes frustrating) aspects of the publishing industry is that different people can and do have completely different reactions to the same book.

What I'm interested in hearing today is why YOU love YA? (Assuming that you do...) What makes YA something you want to write or read? What sets YA apart from other genres in your opinion?